Common Name: Many-Armed Hydromedusa

Scientific Name: Laodicea undulata

Location found: Pump House Beach, About 15 feel below sea level

Habitat type: They float along coasts near the surface from MA to the West Indies.

Physical description: They have a slightly flattened half sphere shape with hundreds of tentacles around the edge that are usually coiled. They have four white radial canals that do not connect in the middle and their body is mostly transparent. They are about 1.5 inches in diameter.

Fun fact: The best way to determine these from the White-Cross Hydromedusa is that the Many-Armed Hydromedusa has spiral gonads on the cross.

Source:
Marine Life of the Northern Atlantic - Martinez